<div class="y-tree">
  <div class="tree-node">
    <div class="tree-node-title">
      <div class="indent">&nbsp;</div>
      <div class="switcher"></div>
      <div class="checkbox"><input type="checkbox" ></div>
      <div class="tree-node-content">测试</div>
    </div>
    <div class="children" style="display: none;"></div>
  </div>
</div>
